JP5721790B2 - COMMUNICATION DEVICE, COMMUNICATION DEVICE CONTROL METHOD, PROGRAM, AND SYSTEM - Google Patents

Description

  The present invention relates to a communication device that changes a communication speed, a communication device control method, a program, and a system.

  2. Description of the Related Art Conventionally, there are display devices that transfer and store video information stored in an imaging device using a PAN (Personal Area Network) such as a USB, and execute playback control of the video information.

  In addition, with the advent of a wireless communication interface (wireless PAN), it is also possible to transfer content data stored in the imaging device wirelessly to a video storage device. For example, Patent Document 1 describes a technique for wirelessly transferring content data stored in an imaging apparatus to a personal computer.

JP 2002-142212 A

  However, display and playback control operations of the transferred video file must use the operation unit of the transfer destination device, and the operation unit of the device familiar to the user cannot be used. Therefore, the user has to recognize the operation method such as desired reproduction (Fast Feed, Rewind, Still, Slow, etc.) of the video file for each operation unit of the transfer destination device. It was.

  Therefore, there is a demand to perform a display and playback control operation of the transferred video file by using the operation unit of the apparatus familiar to the user. In order to implement this, it is necessary to communicate between devices and transfer data.

  However, if the device that the user is familiar with is separated from the transfer destination device, there is a problem that the communication quality deteriorates or the connection is disconnected.

  In view of the above problems, an object of the present invention is to solve a problem that occurs when a distance between devices that perform communication increases.

  The communication device of the present invention reproduces the data stored in the storage unit according to a predetermined instruction, an acquisition unit that acquires data from an external device, a storage unit that stores the data acquired by the acquisition unit Replay means and control means for controlling whether or not to erase the data from the storage means in response to the disconnection of communication with the external device based on the type of the data

  According to the present invention, when disconnecting from an external device, the data can be erased according to the data type.

The system block diagram of this embodiment. Conceptual diagram of connection state of proximity wireless communication device of this embodiment Functional block diagram of the close proximity wireless transfer device of the present embodiment Flowchart of link setup / release between communication applications using close proximity wireless communication according to the first embodiment Sequence chart of link setup / release between communication applications using close proximity wireless communication according to the second embodiment Flowchart of link setup / release between communication applications using close proximity wireless communication according to the third embodiment

<Embodiment 1>
FIG. 1 is a system configuration diagram of this embodiment. This system includes an imaging device (101) as an example of a communication device, an image storage device (102) as an example of an external device, and a display (104). The imaging device (101) and the image storage device (102) are connected by close proximity wireless communication (103).

  The close proximity wireless communication (103) can be connected by switching to a communication speed according to the wireless connection quality. As the close proximity wireless communication (103), for example, there are contactless IC card wireless communication using electromagnetic induction, NFC (Near Field Communication), communication using an induction electric field, and the like.

  The display (104) communicates with the imaging device (101) via the image storage device (102). The display (104) and the image storage device (102) are connected by an adapter cable (105).

  FIG. 2 is a conceptual diagram of the proximity wireless communication connection for each state of the imaging device (101) and the image storage device (102) in the embodiment of the present invention.

  Reference numeral 20 denotes a connection state in which the imaging device (101) and the image storage device (102) are close to each other. In the proximity state (20), the imaging device (101) and the image storage device (102) can communicate at an arbitrary communication speed from high speed to low speed. In this state, the imaging device (101) can transfer content data (first data) such as a video file to the image storage device (102) at high speed. Note that the communication speed is changed by changing the encoding method, modulation method, spreading code, and the like used in wireless communication.

  Reference numeral 21 denotes a state in which the imaging device (101) and the image storage device (102) are separated from each other in the proximity state (20). When the imaging device (101) and the image storage device (102) execute high-speed communication in the semi-close proximity state (21), communication frame errors frequently occur.

  Reference numeral 22 denotes a state in which the imaging device (101) and the image storage device (102) are further separated from each other than the semi-proximity state (21) and disconnected.

  FIG. 3 is a functional block diagram of the imaging device (101) and the image storage device (102) in the embodiment of the present invention.

  Reference numeral 301 denotes a close proximity wireless communication unit that performs close proximity wireless communication (103).

  A communication control unit 303 controls the communication interface of the imaging apparatus (101). The communication control unit (303) includes a CPU and a memory (not shown). 314 is a communication state storage unit that stores which connection state (20 to 22) of the imaging apparatus (101).

  Reference numeral 305 denotes an in-device application that provides an imaging / storage function of the imaging apparatus (101).

  The in-device application includes an imaging unit (310), an operation unit (311), a captured video storage unit (312), and an imaging application control unit (307).

  The application includes, via communication with the image storage device (102), shooting information transfer control (308) that controls transfer of captured image information, and operation information transfer control (309) that conveys user operation information. I do.

  The control for the communication is configured in combination with a CPU and a memory group in which the imaging application control unit (307) operates.

  A communication control unit 304 controls the communication interface of the image storage device (102). The communication control unit (304) includes a CPU and a memory. Reference numeral 302 denotes a close proximity wireless communication unit that performs close proximity wireless communication (103).

  Reference numeral 317 denotes a communication state storage unit that stores which connection state (20 to 22) the image storage device (102) is in, and 318 denotes a video information output interface (to the display (104) that is a display device). 315).

  Reference numeral 306 denotes an in-device application that provides a transfer information storage / storage information display function of the image storage device (102).

As communication control with the imaging device (101), there is an operation information control unit (320) that receives user operation information, and a video information storage control unit (319) that manages storage and display of information.
The communication control is configured together with a CPU and a memory group in which the video information storage control unit (319) operates.

  Next, the present embodiment will be described using the connection concept diagram of FIG. 2 and the flowchart of FIG.

  FIG. 4 is a flowchart for setting / releasing a link between applications executed by the imaging apparatus (101) when the present system is applied to the system.

  In the close proximity wireless communication (103) for selecting and connecting the communication speed according to the wireless connection quality, three states (20 to 22) as shown in FIG. 2 occur according to the distance between the communication devices.

  In a state (20) where the distance between the devices is sufficiently close (for example, within 3 to 4 cm), high-speed communication is possible. However, in a state (21) where the distance between the devices is long (for example, about 10 cm), errors in communication frames frequently occur when high-speed communication is performed.

  In general wireless communication, communication frame errors are reduced by using a processing sequence of a communication speed automatic control method for reducing the communication speed based on this error detection.

  Here, the user may operate the imaging apparatus (101) after transferring the captured video file. In this case, it falls into the positional relationship of the state (21), and errors in communication frames frequently occur when high-speed communication is executed in this state. For this reason, the processing sequence of the communication speed automatic control method frequently occurs, and transmission of a message related to an operation performed by the user on the imaging device (101) to the image storage device (102) is delayed.

  In particular, when an operation such as desired playback (Fast Feed, Rewind, Still, Slow, etc.) of the transferred video file is delayed, an event corresponding to the instruction occurs at a playback position that deviates from the user's instruction timing. It will be uncomfortable for the person.

  Therefore, in this embodiment, the imaging apparatus (101) sets a link between the in-device applications (305, 306) via the close proximity wireless communication (103) path that selects and connects the communication speed according to the wireless connection quality. (S401 to S403). Here, an application link protection timer is used to maintain a link between applications for a certain period of time even when the proximity wireless communication path is disconnected due to a decrease in communication quality of the proximity wireless communication path. .

  Thereafter, the imaging apparatus (101) confirms whether the service to be executed is transfer of content data (first data) such as a video file (S404).

  If it is not video file transfer, the process proceeds to step S409.

  On the other hand, if it is a transfer of a video file, an imaging device (101) will transfer a predetermined object file to an image storage device (102) (S405). The predetermined target file indicates a file selected by the user, for example. Thereafter, it is determined whether or not the transfer of the target file is completed (S406). If completed, the process proceeds to step S407, and if not completed, the process proceeds to step S405.

  After the transfer is completed, the imaging apparatus (101) of the present embodiment transfers control data (second data) for performing various instructions (Still, slow, etc.) to the image storage device (102).

  In step S407, the imaging apparatus (101) transfers subsequent data at a communication speed that does not cause frequent communication frame errors. Specifically, data is transferred at a low communication speed. In this way, it is possible to suppress a decrease in communication quality.

  In the present embodiment, the minimum value is selected as the communication speed at which communication frame errors do not frequently occur. Thereafter, the image pickup apparatus (101) stores in the image storage apparatus (102) control data (second data) for performing desired reproduction (Fast Feed, Rewind, Still, Slow, etc.) of the transferred video file. Transfer to device (102).

  The image storage device (102) that has received the control data performs desired reproduction or the like of the video file in accordance with the received control data.

  Thereafter, when the close proximity wireless communication path is disconnected, the imaging apparatus (101) appropriately releases the close proximity wireless communication path by performing the processes of steps S409 to S412.

  As a result of the above processing, since the imaging apparatus (101) transfers the control data at a low speed after transferring the content data, the automatic communication speed control is not required and a message delay relating to the operation performed by the user does not occur. Therefore, convenience for the user is improved.

  In addition, since the imaging device (101) transfers the data after transferring the predetermined data (content data) at a low speed, it is possible to increase the distance between operable devices and reduce the probability of receiving an operation command failure. .

  In the present embodiment, as a method of transferring control data with high error tolerance from the imaging device (101) to the image storage device (102), data is transferred at a low communication speed. However, the present invention is not limited to this. For example, a redundant signal for error detection and correction may be added. The effect mentioned above can be acquired also by this.

<Embodiment 2>
In the present embodiment, the image storage device (102) has a function of deleting the temporary storage file after the application link release (S411) in the flowchart of FIG. A sequence chart in the present embodiment is shown in FIG. In addition, the same code | symbol is attached | subjected about the process similar to FIG. 4, and description is abbreviate | omitted. The system configuration and hardware configuration are the same as those in the first embodiment, and thus the description thereof is omitted.

  When the image storage device (102) stores a video file for the purpose of smooth playback display of a moving image file or the like, the video file may need to be deleted after the playback display is completed. However, in the disconnected state (22), the video file stored in the image storage device (102) cannot be deleted by an operation on the imaging device (101) side.

  As a countermeasure, when the release of the application link between the in-device applications (305-306) is recognized (501) on the image storage device (102) side, the temporary storage file data acquired on the image storage device (102) side is stored. Add implementation of erasure (502).

  As a method of identifying the temporary storage file data and the permanent storage file data, it is assumed that the notification is performed in the transfer process of the video file to be transferred. Also good.

  Further, the image storage device (102) recognizes the close proximity wireless communication channel release (S412), and when it recognizes it, the temporary storage file data acquired on the image storage device (102) side is deleted. May be.

  With the above processing, even when the close proximity wireless communication (103) falls into the disconnected state (22), the image storage device can appropriately discard the temporary storage File Data.

<Embodiment 3>
In the first and second embodiments, control data for performing desired reproduction (Fast Feed, Rewind, Still, Slow, etc.) of the video file, which is transferred after the video file is transferred to the image storage device (102), Transferred at a lower communication speed.

  In this embodiment, when the data to be transferred after transferring the video file to the image storage device (102) is the control data, the data is transferred at a low communication speed.

  Since the system configuration and hardware configuration in this embodiment are the same as those in the first embodiment, the description thereof is omitted.

  FIG. 6 shows a flowchart for setting / releasing links between applications executed by the imaging apparatus (101) according to this embodiment. In addition, the same code | symbol is attached | subjected about the process similar to FIG. 4, and description is abbreviate | omitted.

  Also in this embodiment, the image apparatus (101) sets a link between the in-device applications (305, 306) via the proximity wireless communication (103) path that connects by selecting a communication speed according to the wireless connection quality. (S401 to S403). Thereafter, the imaging apparatus (101) confirms whether the service to be executed is transfer of content data (first data) such as a video file (S404).

  If the video file is to be transferred, the imaging device (101) transfers the predetermined target file to the image storage device (102) (S405). Thereafter, it is determined whether or not the transfer of the target file is completed (S406). If completed, the process proceeds to step S601, and if not completed, the process proceeds to step S405.

  In step S601, the data transferred to the image storage device (102) in the image pickup device (101) is control data for performing desired reproduction (Fast Feed, Rewind, Still, Slow, etc.) of the transferred video file. Determine whether.

  If it is control data, the communication speed is reduced (preferably Minimum), and the control data is transferred (S602).

  With the above processing, the imaging apparatus (101) transfers the data after transferring the predetermined data (content data) at a low speed when the data is control data. The reception failure probability can be reduced.

<Embodiment 4>
According to the present invention, a recording medium recording software program codes for realizing the above-described functions is supplied to a system or apparatus, and a computer (CPU, MPU) of the system or apparatus reads and executes the program codes stored in the recording medium. It may be. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

  As a storage medium for supplying the program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, a ROM, a DVD, or the like is used. it can.

  Further, by executing the program code read by the computer, not only the above-described functions are realized, but also the OS running on the computer based on an instruction of the program code partially or entirely of the actual processing. To realize the above-described function. OS is an abbreviation for Operating System.

  Further, the program code read from the storage medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Then, based on the instruction of the program code, the CPU provided in the function expansion board or function expansion unit may perform part or all of the actual processing to realize the above-described function.

  In the first and second embodiments, an example using application to a proximity wireless communication system with a variable communication speed has been described. However, the present invention can also be applied to a peer-to-peer communication system capable of changing a communication speed such as optical communication.

101 Imaging device 102 Image storage device 103 Proximity wireless communication medium

Claims (10)

Acquisition means for acquiring data from an external device;
Storage means for storing the data acquired by the acquisition means;
Reproducing means for reproducing the data stored in the storage means according to a predetermined instruction;
Control means for controlling whether or not to erase the data from the storage means in response to disconnection of the communication with the external device based on the type of the data;
A communication apparatus comprising:   The communication apparatus according to claim 1, wherein the acquisition unit acquires the data from the external apparatus by wireless communication. And further comprising a receiving means for receiving the predetermined instruction from the external device,
3. The communication apparatus according to claim 1, wherein the reproduction unit reproduces the data stored in the storage unit when the predetermined instruction is received by the reception unit. 4.   The first communication speed when acquiring the data by the acquiring means is different from a second communication speed when receiving the predetermined instruction by the receiving means. Communication device.   The communication apparatus according to claim 4, wherein the second communication speed is lower than the first communication speed.   6. The communication apparatus according to claim 4, wherein the second communication speed is a lowest communication speed among communication speeds supported by the reception unit. When the data is a data type to be erased after reproduction by the reproduction means, the control means erases the data from the storage means in response to the disconnection with the external device,
When the data is of a data type that is not erased after reproduction by the reproduction means, control is performed so that the data is not erased from the storage means in response to disconnection of communication with the external device. The communication device according to any one of claims 1 to 6.   8. The communication apparatus according to claim 7, wherein the data type that is erased after the data is reproduced by the reproducing means is temporary storage file data. A communication device control method comprising:
An acquisition process for acquiring data from an external device;
A storage step of storing the acquired data in a storage unit;
A reproduction step of reproducing the data stored in the storage unit according to a predetermined instruction;
A control step for controlling whether or not to erase the data from the storage means in response to the disconnection with the external device based on the type of the data;
A control method characterized by comprising:   The program for operating a computer as a communication apparatus of any one of Claim 1 to 8.

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